In the same modern world as proposed, there are Giant humanoids with a decent population of 50,000,000 . But not in the sense of Robert Wadlow, who grew up almost up to 9 feet; but instead they average out 12 feet in height (some can be bigger, some can be smaller).

Edit: Since apparently people want more specifics of what kind of giants they need to know, I'm imagining they follow the top answer of here, with additional thicker arms and feet similar to elephant feet.

Considering that there are buses, trains, trams, and cars like our own, possibly slightly more advanced, what could be convenient enough for the giants to go about their lives on public transit?

$\begingroup$Is this question about what existing vehicles would be acceptable or how you design e.g. a train that is suited for those people sitting down? Btw where I come from you don't have to sit down on a train or bus$\endgroup$
– Raditz_35May 12 '18 at 12:43

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$\begingroup$@Spencer Oh come on, nothing in fiction makes sense or it wouldn't be fiction. Please need to stop beating people over their head with that thing every time someone mentions the word "giant"$\endgroup$
– Raditz_35May 12 '18 at 12:45

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$\begingroup$@Raditz_35 Please remember to be nice and to, perhaps particularly in this case, assume good intentions.$\endgroup$
– a CVn♦May 12 '18 at 13:06

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$\begingroup$if those 50 million giants were taking part in the evolution of mankind, somehow managed to survive 'regular' human dominance, and take part in everydays life, everything would have been designed to suit them, as part of product design evolution...no?$\endgroup$
– t.ryMay 12 '18 at 13:28

3 Answers
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Hmmm. It's hard for my mind to keep from imagining a bunch of giant go-carts on the highway, Mario Cart-style. More to the point, with most vehicles the design could be more-or-less the same as human cars, but with reduced space for passengers. An SUV-sized vehicle might only seat two giants (including the driver), for example. A giant family (re: a family of giants) might have to take a minimum of two cars when traveling anywhere.

I could imagine buses and subways having special seats dedicated to giants and charging giants an extra fee for the extra space. Because of that, I would imagine specialized taxis would be a lot more appealing for the Goliath on the go. Alternatively, maybe they have their own bus system or get picked up for work with flatbed trucks. I guess if would all depend of what percentage of the population are giants.

All of these have the issue of being expensive for the average giant consumer. Maybe only more prosperous giants move to cities? Or perhaps cities in this world cater to pedestrians more than our own cities. After all, with there massive stride length, a giant could probably walk at 6.0 mph without much effort. Just make sure the city planner puts the giant district right next to where giants work (docks? warehouses?). Maybe a giant could use a specially constructed bicycle/quadracyle.

I think this is more of an economics question, and the answer depends on how common giants are. Modern manufacturers design their products to accommodate the vast majority of their target market, in a one-size-fits-all approach. Think of this question: what would vehicles look like if many of us were hobbits?

50 million giants worldwide would probably end up rather marginalized. Perhaps one subway car per train would have the seats and bars ripped out for them. Niche small businesses would customize semi trucks for giants, and safety laws would limit how large a scrap metal motorcycle can get.

If giants are common enough, vehicle cabin sizes would get bigger, as would everything else. Train tracks, car lanes, and airport runways would be wider. Car doors and subway seats would have fold-out steps or ladders for wee humans to climb up, and safety features like seatbelts would have to be more flexible. Humans would be more comfortable in sub-compact cars, but they'd still have to scoot the seats way up to reach the pedals. Here, specifically sized products would only be common where necessary (e.g. clothes, chainsaw grips, tableware, door handles). Niche vehicle markets might be possible, but would necessitate special safety requirements: human-size motorcycles would have to be incredibly sturdy to meet crash safety ratings, proportionally huge bumpers, etc.

While this would finally make the Starbucks Venti size reasonable, I refuse to sit in a booster seat at restaurants. That's just degrading.